[Mono-dev] System.Diagnostics configuration bug

[Tomasz Noiński]

Hi,

I've found a bug in configuration of System.Diagnostics (i.e. stuff in
system.diagnostics section in the *.config file).
I filed a bug report (#81296), but there has been no answer for a
month. Maybe bugzilla isn't the place to file bugs anymore?

I'd be really glad for at least some pointers to how I could
help track this bug down.

The problem is that a .config file like that:

--- SwitchTest.exe.config ---
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
        <system.diagnostics>
                <switches>
                        <add name="t" value="1" />
                </switches>
                <trace>
                        <listeners>
                                <clear/>
                                <add name="configConsoleListener"
type="System.Diagnostics.ConsoleTraceListener" />
                                <add name="logfileListener"
                                       
type="System.Diagnostics.TextWriterTraceListener"
                                        initializeData="log.log" />
                        </listeners>
                </trace>
        </system.diagnostics>
</configuration>
--- End of SwitchTest.exe.config ---

...doesn't set the "t" switch.
If I comment out the "logfileListener" line, the "t" switch _is_ being
set.

I think it's because the "logfileListener" is created _twice_ by
DiagnosticsConfigurationHandler.AddTraceListeners().
When it's being created for the second time, AddTraceListener() throws
a "Sharing violation" exception:

--- exception dump ---
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invoc
ation. ---> System.IO.IOException: Sharing violation on path log.log
  at System.IO.FileStream..ctor (System.String name, FileMode mode, FileAccess access, FileShare share, Int32 buffer
Size, Boolean anonymous, FileOptions options) [0x00000] 
  at System.IO.FileStream..ctor (System.String name, FileMode mode, FileAccess access, FileShare share) [0x00000] 
  at (wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess
,System.IO.FileShare)
  at System.IO.StreamWriter..ctor (System.String path, Boolean append, System.Text.Encoding encoding, Int32 bufferSi
ze) [0x00000] 
  at System.IO.StreamWriter..ctor (System.String path, Boolean append) [0x00000] 
  at (wrapper remoting-invoke-with-check) System.IO.StreamWriter:.ctor (string,bool)
  at System.IO.File.AppendText (System.String path) [0x00000] 
  at System.Diagnostics.TextWriterTraceListener..ctor (System.String fileName, System.String name) [0x00000] 
  at System.Diagnostics.TextWriterTraceListener..ctor (System.String fileName) [0x00000] 
  at <0x00000> <unknown method>
  at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (object,object[])
  at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder bind
er, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] --- End of inner exception stack
 trace ---

  at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder bind
er, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] 
  at System.Reflection.MonoCMethod.Invoke (BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[]
 parameters, System.Globalization.CultureInfo culture) [0x00000] 
  at System.Reflection.ConstructorInfo.Invoke (System.Object[] parameters) [0x00000] 
  at System.Diagnostics.DiagnosticsConfigurationHandler.AddTraceListener (System.String name, System.String type, Sy
stem.String initializeData) [0x00000] 
--- end of exception dump ---

I tried to repair it myself, but I couldn't find the place where
DiagnosticsConfigurationHandler methods are called -- it's not
straightforward, machine.config is involved etc.

If you find the time, please look into this bug or give me some
pointers on how to proceed.

TIA,

Noix